Dynamo-electric machine.



` R. J. DEARBORN.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED 0011.7, 1908.

1,042,408, l Patented Oct.29,1912.

g1WITNESSES: l .i /QSVENTOR UNITED sTATEs4 PATENT OEEICE- .RICHARD J. DEARBOBN, loF EDGEWooD PARK, PENNSYLVANIA, AssreNon To WEST- INGHOUSE ELECTRIC AND sYLvANIA.

MANUFACTURING COMPANY, A CoRPoRAjrIoN or PENN- DYNAMo-ELECTBIC MACHINE. A

Specification of Letters .Patent.

Patented Application led October 7, 190B. Serial No. I$556,604.

To all whom t may concern.'

Be is known that I, RICHARD J. DEAR- nonN, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny Vand State of Pennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines, of which the following is a specification.

My invention relates to electrical machines, and ithas special reference to magnetizable core members which are provided with coil-containing slots.

The object of my invention is to provide a simple and durable means for etfectually holding the coils of open-slot machines in position against the action of centrifugal, magnetic and other forces tending to displace them and, at the same time, to proi' vide the operating advantages which pertain to machines slots.

Induction motors and other dynamo-electric machines areoften utilized in rolling mills and in .other places where continuous operation is desired and where av material loss would result if considerable time was required for repairing their windings. In such cases, it is ,especially desirable that the core slots be of the open type having substantially parallel side walls so that injured coils may be removed without difficulty.

According to my vide means for holding the coils of open-slot machines in position and, at the same time, secure the well known advantages incident having partially closed `to the use of partially closed slots.

The single figure of the accompanying drawing is a partially sectional view of a portion of a dynamo-electric machine embodying my invention.

Referring to the drawing, the magnetiz-v able core structure l, having a plurality of peripheral slots 2 in which coils 3 are disposed, is provided with an improved means I for holding the coils'in position in the slots.

My improved wedge structure comprises a pair of magnetizable strips 4 having their adjacent edges beveled and their outer edges provided with longitudinal beads 5 which are adapted to engage semi-cylindrical grooves 6 near the opening in the core slot,

and a key 7 of non-magnetizable material which comprises a flat strip having-a lateral projection 8 of dove-tail section.

In applying the wedge structure to a present invention, I pro-' dynamo-electric machine after the coils are 1n position, the magnetizable strips are first placed 1n position, with thin strips 9 of insulating material separating them from the core structure and from the walls of the grooves 6. The key 7 is then forced into place so that the magnetizable strips 4 are pressed firmly against the sides of the slot, with the beads 5 in the grooves 6, and the coils -3 are forced inwardly so that it is impossible for them to be displaced by the forces to which they are ordinarily sub. jected.

It will be observed that the form of thel I core teeth usually partially closed mated, while the found in machines having slots is closely approximagnetizable strips are `separated by a slight amount of insulation from the core proper, in order to avoid eddy' current losses. In addition to t-he foregoing, the parts of which the wedges are constructed are all simple and the magnetizable members are interchangeable so that the expense of manufacture and assembly is reduced to a minimum. The fact that the magnetizable members are not driven into place is also of advantage, since a very thin insulating fabric, which would otherwise be destroyed during the assembling process, may be employed. p

. Since structural modifications may be effected within the spirit and scope of my invention, I desire that only such limitations shall be imposed as are indicated in the appended claims.

I claimaas my invention:

1. In a dynamo-electric machine, the combination with a magnetizable core member having a plurality of coil-containing slots, of wedges adapted to be assembled in the mouths of the slots for holding the coils inv posit-ion independently of the coil reaction, each of which comprises magnetizable side stripshaving adjacent edge faces that diverge outwardly and a non-magnetizable key forced between said strips and having surfaces that closely fit the inner side and edge faces thereof.

2. In a dynamo-electric machine, the combination with a magnetizrable core member having a plurality of coil-containing slots and longitudinal grooves near thevmouths of the slots, of wedges for holding the coils in position, each of which comprises strips of magnetizable material and a rigid key of non-magnetizable material adapted to be inserted after the magnetizable strips are in position to force the outer edges of sai strips into the grooves and having faces that interlock with thel inner faces of the strips to prevent inward and outward movement of said key.

3.v In a dynamo-electric machine, the combination with a magnetizahle core member having teeth which form slots for the reception of coils and are provided with grooves in their sides and adjacentto their free ends, of wedges for holding the coils in position in the slots, each of which comprises magnetizable strips having lateral projections,

the adjacent edges of the strips bein beveled, and a non-magnetizable key a apted d 'to be inserted after the magnetizable strips are in position and having a. projection of dove-tail section that engages the beveled 20 edges of said strips and forces the lateral projections into the grooves.

In testimony whereof, l have hereunto rlcribed my name this 30th day of Sept.,

RICHARD J. DEARBORN.

Witnesses: Orro S. SGHAIRER, BIRNEY HINES. 

